- ColecciónDX19 - Cotton Family Papers
- SerieC - Francis Cotton : Family and general correspondence, personal papers : 66 to 133
- Family Correspondence
- Unidad documental simple67 - Thomas Cotton and his brother Francis
- 1 - Letter Francis to Thomas Cotton
- 2 - Letter Francis to Thomas Cotton
- 3 - Letter Thomas to Francis Cotton
- 4 - Letter Thomas to Francis Cotton
- 5 - Remembrance Card Thomas Cotton